Usually means: Very rarely; almost never happens.
Definitions Related words Mentions
We found 16 dictionaries that define the word once in a blue moon:

General (14 matching dictionaries)
  1. once in a blue moon: Longman Dictionary of Contemporary English
  2. once in a blue moon: Merriam-Webster
  3. once in a blue moon: Oxford Learner's Dictionaries
  4. once in a blue moon: Collins English Dictionary
  5. once in a blue moon: Wordnik
  6. once in a blue moon: Cambridge Advanced Learner's Dictionary
  7. once in a blue moon: Wiktionary
  8. once in a blue moon: Dictionary.com
  9. Once in a Blue Moon (song), Once in a Blue Moon: Wikipedia, the Free Encyclopedia
  10. once in a blue moon: FreeDictionary.org
  11. once in a blue moon: TheFreeDictionary.com
  12. Once in a blue moon: Phrase Finder

Miscellaneous (1 matching dictionary)
  1. once in a blue moon: Idioms

Slang (1 matching dictionary)
  1. once in a blue moon: Urban Dictionary

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Definitions from Wiktionary (once in a blue moon)

▸ adverb:  (idiomatic) Very rarely; very infrequently.

Similar:
once in a while, semioccasionally, seldom, once in a way, occasionally, once in awhile, fewly, unfrequently, once and awhile, once and a while, more...

Opposite:
frequently, regularly, often, commonly

Adjectives:
seldom, just, rare, few and far between, remote, blind, only, right, everliving, onelie, maybe

▸ Words similar to once in a blue moon

▸ Usage examples for once in a blue moon

▸ Idioms related to once in a blue moon

▸ Wikipedia articles (New!)

▸ Words that often appear near once in a blue moon

▸ Rhymes of once in a blue moon

▸ Invented words related to once in a blue moon

Similar:
once in a while, semioccasionally, seldom, once in a way, occasionally, once in awhile, fewly, unfrequently, once and awhile, once and a while, more...

Opposite:
frequently, regularly, often, commonly

Adjectives:
seldom, just, rare, few and far between, remote, blind, only, right, everliving, onelie, maybe



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